A majority of New Zealanders favour currency union with Australia, according to a One News-Colmar Brunton survey.
The poll of 1000 voters found 51 per cent in favour of a transtasman dollar, and 36 per cent against.
Labour and Alliance voters were more likely to favour a single dollar.
Prime Minister Helen Clark has welcomed debate on the single dollar, but has indicated it is a longer-term prospect, once closer business links and law harmonisation with Australia are achieved.
The issue is not on the formal agenda for discussion when she meets Australian Prime Minister John Howard on September 28.
But she said she would be surprised if it was not discussed informally.
"Ever-closer economic integration with Australia is inevitable," she said.
"In a globalised world you look for more critical mass."
New Zealand was working through initiatives such as Apec and a free-trade agreement with Singapore.
Deputy Prime Minister Jim Anderton said tens of thousands of New Zealand jobs would be lost from a merger of the currencies.
Single transtasman currency finds favour in NZ
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